Elevatable stove oven



L. H. RENSHAW ELEVATABLE STOVE'OVEN Aug. 17, 1948.

Filed April 1, 1946 3 Sheets-Sheet 1 20 Jfi 7 e s e Aug. 17, 1948. L. H. R'ENSHAW 2,447,364

ELEVATABLE STOVE OVEN Filed April 1, 1946 :5 Sheets-Sheet 2 ".IJJI' 39322122722 25 I HH I I WHHHI v Aug. 17, 1948- L. H. RENSHAW ELEVATABLE STOVE OVEN 3 Sheets-Sheet 3 Filed April 1, 1946 portion of the stove.

Patented Aug, 17, 1948,

UNITED STATES; PATENT orries WWW s'rova ovan Lewis B. Bensliaw, Washington, a. c. Application April l, 1948, Serlal No. 658,683 r 3 Claims. (c1. 126-19) 1. Generically this invention relates to stoves, but it more particularly relates to an elevatable oven continuation of the front of said burner section,

and a hydraulic system in said casing for raising and lowering said oven and having control means exterior of the casing.

. Afurther important object of this invention is the provision of an oven in conjunction with the stove surface burner portion and vertically movable with respect thereto, and ahydraulic means in connection with said oven including a fluid supply system for raising. the oven and a fluid' discharge or waste system for lowering said oven, and a control means common to both systems operable to effect their respective control.

With these and other objects in view, which will become apparent as the description proceeds, the invention resides in the construction, combination, and arrangement of parts, hereinafter 2 more or less dangerous to light the oven burner and diificult to determine whether it is properly lighted and if not, thereby causing ,likelihood of explosion from escaping gas; which may result in injury by burnst'othe operator, which injury may likewise happen when attempting to 1111 the oven at a low level. Such construction also rendering it diiilcult to observe the stages of cooking,

necessitating repeated stooping in order to see within the oven, and it was to overcome such disadvantages that I designed the instant invention, comprising my improved oven structure and casing therefor hydraulically elevatable from its normal position within said casing to an exposed easily fillable and tendabie position, eliminating uncomfortable and awkward stooping and aflording a clear view of the oven and its contents and minimizing the danger of .burns sooften sustained by the cook because of limited visibility,

the hydraulic system being readily connected to the domestic water supply system, rendering the cost of operation negligible and operatively con I trolled by a single control means on the exterior more fully described and claimed, and illustrated in the accompanying drawings, in which like characters of reference indicate like parts throughout the several figures, of which:

Fig. 1 is a view in elevation of my improved stove with the oven in raised position.

Fig. 2 is a vertical sectional view of the oven portion of the stove with the oven in lowered position.

Fig. 3 is a horizontal section on the line 3-3 oi Fig. 2.

1'18. 4 is a similar view to Fig. 2 with the oven in raised position.

i Fig. 5 is a detailed perspective view of the hydraulic or circulation system with the oven and easing removed.

Fig. 6 is a front fragmentary elevation of the control valve and connecting conduits.

Fig. '7 is a similar View to Fig. 6 but in section showing the valve as permitting flow of the fluid in piston raising direction.

8. 8 is a similar'view to Fig. '1 showing the valve in position to permit the fluid flow in discharging direction to waste.

surface of the casing, corresponding substantially in appearance to the surface burner controls, said means controlling the raising and lowering of the oven and the arrest of. the oven at any desired level for the ready insertiim in or inspection of its contents.

In the illustrated embodiment characterizing this invention there is shown a stove K of conventional construction using gas, electricity, or other suitable fuel having the usual burner fuel controls I, utility drawer 2 and drip pan 3 and an improved hydraulic oven structure B,

The oven structure B comprises, in the present instance, a square supporting base at the four comers of which are the supporting elements 5 suitably secured to saidbase and on which are suitably mounted the hydraulic cylinders 6 in which are mounted the pistons l suitably connected to the lower ends of piston rods 8.

The oven B is formed with spaced top and botnuts I! and I8 said members are-supported and The stoves with which I am familiar have proven deficient in many respects especially where the top surfaces of burner and oven are in the same plane rendering it inconvenient and secured, thereby permitting slight leveling or vertical adjustment of said oven should it become necessary. If desired the supporting nut I! may be fixed. The oven thus suspended may be raised and lowered by said pistons. as will directly more fully appear.

The hydraulic fluid circulating system for operating the pistons 1 comprises a supply conduit I9 suitably connected to one side of a threeway control valve 29 as at 2|, one end of conduit 22 is suitably connected to said valve as at 23, the other end as at 24 connected to and communicating with the conduit 25 encircling the four cylinders 8 adjacent their lower ends and communicating with each cylinder by the lead in stub conduits 29below the pistons 1, and'in their lowermost position, asclearly shown in Fig. 2, for a purpose directly more fully appearing. Said conduits l9 to 23 constitute the fluid supply system from a source connected to conduit l9 such as the faucet of a domestic water supply, hereafter more fully explained. Encircling cylinders 9 adjacent their upper ends is a continuous conduit 21, similar to conduit 25, connected to a waste or discharge conduit section 29 connected to valve 29 as at 29, said conduit section 29 being connected to and communicating with waste conduit 21 by siphon conduit 30 as at 3|. Said conduit 21 is connected to the respective cylinders 6 at their upper ends by the stub or short conduits 32 similar to conduits 26, except the fluid is adapted to normally flow from the cylinders in discharging direction from conduit I 21 through the lead-off or what may be termed siphon conduit 39 and conduit 29 to the domestic or sewer drainage system not shown. Said conduits 32 communicate with the cylinders 6 sufficiently below their upper ends to leave air cushion spaces 33 between the tops of the cylinders and the pistons to prevent sudden stoppage and contact of said pistons with the ends of the cylinders, when approaching their limit of travel in oven raising direction.

The three-way control valve 29 is of conventional construction and the rotatable cut-off member 34 operated by handle 35 is formed with a right angle conduit 33 adapted when positioned as shown in Fig. 7 to register. with conduits l9 and 22 to permit flow of the fluid to the cylinders for effecting upward movement of the pistons I and raising of the oven, and movement of said valve member 34 to position conduit 36 in registration with conduits 22 and 29 (Fig. 8), cuts oil the fluid supply flow to the cylinders through conduit 22 and permits the flow in reverse direction from the cylinders through said conduits 26, 23, 22, valve 29, and conduit 29 to waste, permitting the return of the pistons and oven to their initial lowered position. The arrangement of the waste system including the conduits 32, 21, 39 and 29 functions to carry ofi any water or fluid in the cylinders, and impelled upwardly by the said pistons as they ascend in oven raising direction. Said waste system also. acts as a safety means, to permit the continued flow of the fluid in piston raising direction, when said pistons have ascended above the conduits 32, and to maintain the oven in elevated position until valve 29 is operated to cut off said flow.

Movement of member 34 to cut-oil position withconduit 39 out of registration with the associated'conduits or in neutral position, cuts off the flow of the fluid, thereby permitting the oven and associated parts to remain stationary at any desired height within the reciprocal range of said pistons and oven from complete lowered to complete raised position, as desired.

The oven 13 is provided on the inner surfaces of opposite side-walls II with vertical series of ing an operating handle 6|.

oppositely disposed angle brackets 21 welded or otherwise suitably secured thereto which are adapted to support the removable oven racks 33. Vertically spaced from the bottom III is an uninsulated bottom member 39 removably mounted or welded or otherwise suitably connected to the four walls H and constituting the cooking oven bottom 39 so as to form within the insulated oven structure a burner chamber 49 in which is mounted, in the present instance, a gas burner comprising the burner units 4i connected by gas conduit 42 and supported on the feet or spacer supports 43 suitably secured to bottom I0. A fuel inlet pipe 44 extends through bottom 19, support 43 and to burner 4| as at 45 to which it is suitably'connected. Mounted on said pipe 44 is a washer or threaded nut 49 for effecting rigid connection of said pipe with bottom l9. One end of a flexible conduit or suitably insulated supply medium 41 for gas or electricity is connected to the free end of pipe 44 by the detachable connection 48, and the other end 49 is suitably connected to a gas or the like control valve 50 connected to a source of fuel supply and hav- The flexible fuel supply member 41 is of a length suitable to permit the raising and lowering of the oven from its normal lowered position as shown in Fig. 2 to its completely raised position as shown in Figs. 4 and 1, as will be well understood.

A casing 52 substantially square in configuration is adapted to house and conceal the hydraulic mechanism as shown in Fig. 5 and normally including the oven B as shown in Fig. 2. Said cas-- ing 52 is suitably connected to stove section A and may be formed of any suitable material such as that of the fixed body portion A or otherwise. The front wall 53 of said casing forms a continuation of the front surface of the stove body A and preferably conforming in appearance thereto, and mounted on the outer surface of front panel 53 is the hydraulic control'handle 35 and fuel control handle 5| in alignment with the fuel controls i of section A. The walls of said casing are formed at their upper edges with lateral inwardly projecting flanges 54 on which are adapted to seat the slightly off-set peripheral flange 55 of the casing top 56, which in the present instance, is slightly raised and supported on and secured to said top 59 as at 56'. It is to be understood that said top may be completely flat, if desired. Said top 53 is adapted, when the oven is in its normal lowered position, to substantially constitute a continuation of the top of stove portion A and conforms as substantially, as may be to the appearance thereof.

It is obvious that the oven door l4 may be provided with a sight window so that the oven contents may be viewed during the cooking operation without opening of the door l4, and without departing from the principle or scope of this invention.

While the operation of the device would-seem .to be clear from the above description it might -oven, and any water that may be in the cylinders above the pistons will be discharged through conduits 32, 21, 39 and 29 to waste, and the pistons as they reach the upper ends of the cylinders v will be cushioned against shock bythe air in air spaces 33, at the same time the position of conduits 32 permits the escape of the fluid to maintain the oven in its completely elevated position, prior to the operation of valve handle 35 to neutral position to out 01f the flow, the oven then being maintained in elevated position, and operation of said handle to the position shown in Fig;

8 connects the normal supply conduit section 22 with conduit 29 to waste, to empty the cylinders and return said oven to its normal lowered position, and the oven may be arrested at any desired level, when moving in either direction, by the movement of handle 35 to neutral position, as will be well understood.

It will be apparent from the above description that I have provided a stove including a unique oven device normally housed within a casing and a top for the casing constructed of the same material as the casing and adapted to serve as a table surface when the oven is in lowered position, and which is an advantage not only to symmetrize the device but to protect the oven and hydraulic mechanism from grease and dirt, such device being simple in construction, inexpensively operable, readily controllable, manufacturable at a reasonable cost and emcient for the purposes intended.

Although in practice it has been found that the form of the invention illustrated in the accompanying drawings and referred to in the above description as the preferred embodiment is the most efllcient and practical, yet realizing that conditions concurrent with the adoption of the invention will necessarily vary, it is well to emphasize that various minor changes in details of construction, proportion and arrangement of parts, may be resorted to within the scope of the appended claims without departing from or sacrificing any of the principles of the invention. 7

Having thus described the invention, what is desired protected by Letters Patent is as set forth inthe following claims:

1. In a stove, the combination with a fixed body. an oven vertically movable relative thereto, a hydraulic means surrounding said oven and including piston and piston rod containing cylinders,

means in connection with said oven and coactin with said piston rods to suspendingly support said oven, piston rod guide means in connection with said cylinders, afluid supply system including a fluid supply means and a conduit encircling and in communication with the lower portions of'the cylinders, a multiport control valve for said hydraulic means, a fluid waste system including an exhaust means and a conduit encircling and in communication with the upper ends of said cylinders, said system being in communication with one port of said valve, said fluid supply means being in communication with another port of said valve, and said first encircling conduit being in communication with another port of said valve, whereby operation of said valve to one position permits the fluid flow to said cylinders to elevate said even, its operation to another position cuts off the supply flow and at the same time connects said supply system withsaid waste system to empty said cylinders andreturn said oven to its lowered p sition, and its operation to athird position maintains said oven at any desired level within its elevationai range.

2. In a stove, the combination with a stationary burner section, an oven section including a casing, an oven normally disposed in said casing and operable to a position exterior thereof, a hydraulic means in said casing including, at the comers of said oven, cylinders having pistons mounted therein, means in connection with said oven and said. pistons to support said oven, a fluid supply system including a fluid supply means and a conduit encircling and in communication with the lower portions of the cylinders, a multiport control valve for said hydraulic means, a fluid waste system including an exhaust means and a conduit encircling and in communication with the upper ends of said cylinders, said system being in communication with one port of said valve, said fluid supply means being in communication with another port of said valve, and said first encircling conduit being in communication with another port of said valve, said valve having an operating means exterior of said casing, and operable to control the flow of the fluid to said cylinders to raise said oven, operable to cut off said flow and at the same time permit-the flow from said cylinders to waste to lower said oven, and operable to cut of! the flow in eitherdirection to arrest and maintain said oven at any desired level within its elevational range.

3. An oven, a casing adapted-to normally house said oven, a burner for said oven carried thereby, a fuel supply means connected to a source of supply and to said burner, and a fuel control means I in connection with said supply means, a hydraulic means within said casing including cylinders having pistons mounted therein in connection with said oven, said hydraulic means'including a fluid supply system, said fluid supply system including a fluid supply means and a conduit encircling and in communication with the lower portions of the cylinders, a multiport control valve for said hydraulic means, a fluid waste system including an exhaust means and a conduit encircling and in communication with the upper ends of said cylinders, said system being in communication with one port of said valve, said fluid supply means being in communication with another port of said valve, and said first encircling conduit being in communication with another portof said valve, said valve being manually operable exteriorly of said casing to one position to permit fluid flow to said cylinders for raising said oven, operable to another position to cut oil said flow and at the same time permit the flow of the fluid from said cylinders to waste to lower said oven, and operable to a third position to cut off the fluid flow in either direction to maintain said oven at any desired level within its elevational range.

' LEWIS H. RENSHAW.

REFERENCES crrEn The following references are of record in the flle of this patent:

UNITED STATES PATENTS 

